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| ATX (form factor) | |
|---|---|
| Name | ATX |
| Type | Computer motherboard and power supply specification |
| Introduced | 1995 |
| Designer | Intel |
| Dimensions | 305 × 244 mm (standard) |
| Successor | MicroATX, Mini-ITX variants, others |
ATX (form factor) is a widely adopted motherboard and power supply specification introduced in the mid-1990s that standardized dimensions, power connectors, mounting points, and I/O panel placement to improve interoperability among manufacturers such as Intel, IBM, Microsoft, Dell and HP. The specification influenced ecosystem participants including NVIDIA, AMD, ASUS, Gigabyte Technology, and MSI, and shaped product roadmaps in markets like consumer electronics, server hardware, gaming hardware, and workstation manufacturing. ATX also intersected with standards bodies and industry consortia such as the PCI Special Interest Group, USB Implementers Forum, Intel Corporation initiatives, and regional regulatory agencies.
ATX defined a set of mechanical and electrical parameters that united motherboard form, rear I/O alignment, power supply interfaces, and mounting positions for chassis builders like Cooler Master, Thermaltake, NZXT, and Corsair. The specification influenced peripheral standards from vendors including Seagate Technology, Western Digital, Samsung Electronics, and Kingston Technology, and integrated expansion interfaces from the PCI Special Interest Group and VESA. ATX replaced proprietary layouts used by companies such as Compaq, Gateway, Inc., Packard Bell, and Acer Inc. to enable third-party case and power supply compatibility.
ATX was developed by Intel engineers in the context of platform projects involving collaborators like Microsoft and IBM to address limitations of older standards such as Baby AT and proprietary boards used by Compaq. The introduction coincided with shifts in processor platforms from Intel Pentium families to later microarchitectures and spurred updates tied to power management standards like ACPI promoted by Microsoft and Intel. Industry adoption accelerated as OEMs including Dell, HP, Acer Inc., and Sony Corporation transitioned supply chains and chassis suppliers such as Foxconn and Pegatron Corporation standardized manufacturing to ATX mounts.
The ATX specification prescribes dimensions (305 × 244 mm for standard ATX) and mounting-hole coordinates used by chassis makers like Cooler Master and Lian Li, and defines the rear I/O shield footprint familiar to consumers of brands such as ASUS and Gigabyte Technology. Electrical parameters include +3.3V, +5V, +12V rails and control signals standardized to interface designs from Seagate Technology drives and Western Digital devices, and connector pinouts aligned with power supply manufacturers like Delta Electronics. Mechanical details coordinate with expansion slot standards championed by the PCI Special Interest Group and cooling interfaces referenced by Noctua and Be Quiet!.
ATX spawned a family of related formats including MicroATX championed by Intel for compact desktops, Mini-ITX developed by VIA Technologies for embedded systems, and extended sizes used in servers by vendors such as Supermicro and Dell EMC. Industry-specific adaptations include workstation and server standards from Intel Corporation and rack-mounted chassis used by Hewlett Packard Enterprise and IBM. Case and board makers like ASRock, EVGA, and Rosewill produce hybrid layouts and proprietary deviations for gaming and small-form-factor segments influenced by ATX lineage.
ATX introduced a standardized power supply interface with a 20-pin connector later extended to 24 pins, plus supplemental 4-pin and 8-pin CPU power connectors used by platforms from Intel and AMD. The spec formalized signals like PS_ON# and PWR_OK used by system integrators such as Corsair and Seasonic and coordinated with voltage tolerances expected by component suppliers including NVIDIA GPU vendors and storage OEMs like Samsung Electronics. Power efficiency and standby behaviors were subsequently influenced by regulatory frameworks such as energy programs and testing labs operated by UL and Underwriters Laboratories-accredited facilities.
ATX standardized component placement to optimize airflow patterns exploited by thermal solution companies like Cooler Master, Noctua, and Corsair, aligning CPU socket locations relative to chassis fans and heat sink footprints used by Intel and AMD reference platforms. Mounting holes and standoff positions enabled case manufacturers such as Thermaltake and NZXT to design consistent brackets for drive cages from suppliers like Western Digital and Seagate Technology, and to integrate front-panel connectors standardized across vendors including ASUS and Gigabyte Technology.
ATX's widespread adoption facilitated an ecosystem of interchangeable components among OEMs and aftermarket vendors including ASUS, MSI, Gigabyte Technology, Corsair, and Cooler Master, and enabled modular supply chains for contract manufacturers like Foxconn and Pegatron Corporation. The standard affected markets governed by large retailers and integrators such as Best Buy, Newegg, Amazon (company), and enterprise procurement at IBM, Dell Technologies, and Hewlett Packard Enterprise, and helped converge on interoperability that accelerated innovation in graphics, storage, and cooling technologies from companies like NVIDIA, AMD, Samsung Electronics, and Seagate Technology.